Electric accumulator



Oct. 4, 1938. E. w. RAMAKERS ELECTRIC ACCUMULATOR Filed Nov. 11, 1955Patented Oct. 4, 1938 UNITED STATES PATENT OFFICE ELECTRIC ACCUMULATORApplication November 11, 1935, Serial No. 49,294 In the NetherlandsDecember 20, 1934 1 Claim.

The invention relates to an electric accumulator for the storage ofelectric energy,'which may be used for example in motor cars and thelike.

The well-known accumulators comprise cells the plates of which can onlybe removed with difficulty and with a considerable risk of damaging thepasted plates, making inspection and care of the interior impossible forthose not skilled in the art and having no special equipment. With suchstorage batteries the deposit accumulating in the cells, and which maybe considered the principal 'cause of interior short-circuitsis-diflicult to remove, and flushing appears to be of little effect, inpractice, for removing the impurities on the bottom and those betweenthe plates.

Now the invention relates to an electric accumulator having a cover fromwhich the plates are suspended, the plates being arranged in a jacketentirely or partly open at the bottom and constructed as an inner tankplaced within an outer tank or vessel which holds the electrolyte. Theaccumulator is characterized by the fact that the Walls of said innertank near the upper parts are provided with outwardly protruding ribsforming, together with corresponding ribs of the inner wall of the outertank and the upper parts of the walls of both tanks, a gutter-shapedspace which may be filled up with a sealing material.

Further according to the invention inwardly protruding ribs can bearranged on the interior of the walls of the inner tank near the upperparts, the cover of the accumulator being supported by the said ribs,whereby the joint between them may be covered by sealingmaterial. Thishas for its effect that the inner tank can be removed in a simple way,without damaging the plates. The deposit can be removed withoutdifllculty. The impurities and the flimsy insula tlon, if any, betweenthe plates can be easily removed or interchanged. The condition of theplates can be examined. The above mentioned manipulations can even becarried out by unskilled people so that in comparison with the usualconstruction the duration of life is considerably increased by thesimplicity with which the supervision and the cleaning can be effected,whereas the technical advantages can be attained without an increase ofthe manufacturing cost worth mentioning.

The invention will be elucidated by reference to an example shown in thedrawing.

Fig. 1 is a fragmentary section on one corner of the accumulator showinghow the various parts can be scaled up.

Fig. 2 is a side elevation of one of the cells of the accumulator,partly in section, and

Fig. 3 isan elevation of part of the accumulator, at right angles toFig. 2, showing one of the cells partly in section. 5

In the drawing 3 is the inner tank composed, for example of a moldableinsulating material, which in this case has perforated side walls,whereas the bottom side is open; this bottom, however, can also beconstructed only partly 10 open. If necessary the side walls could beprovided with ventilation openings. The said inner tank houses a groupof plates P and is supported upon ridges 6a on the bottom of an outertank 4, with a free space between the side wall of the 15 inner andouter tanks. The inner tank has in- .tegral handles 2 whereby it can beremoved from the outer tank. Near the upper parts the walls of the innertank and the outer tank are provided with ribs 6 (Fig. 1) which aredirected to- 20 wards each other and arranged on a level. After thefitting-up of the cell the said ribs will be in juxtaposition or inengagement. In that case both ribs 6 form the bottom of a gutter-shapedspace the upright walls of which are formed by 5 the upper parts of thewalls 01 both tanks. The said gutter-shaped space may be filled up witha sealing-material such as bitumen, pitch or the like, or with a stripof rubber, in order to bring about a perfect closing. 30

Further the walls of the inner tank can also be provided with aninwardly protruding rib 1 receiving the edge of the cover 8. The edgewhich is formed in this manner may also be closed by a sealing-mass 5.It is also possible, however, to 35 make the cover so that it forms oneunit with the inner tank.

I claim:

In an electric accumulator, a group of plates, a cover from which saidplates are suspended, a 40 jacket surrounding said group of plates andat least partly open at the bottom, said cover being supported upon saidjacket, an outer vessel surrounding said jacket, said jacketand vesselhaving ribs projecting, respectively, outward and 45 inward just belowtheir upper edges, and means in said outer vessel supportihg said jacketso that its rib stands in non-overlapping relation at the same levelwith the rib on said vessel, to form a gutter bottom for receiving asealing 50 material.

EDUARD WILLEM LOUIS RAMAKERS.

